I am attempting to troubleshoot an outbound call failing across a SIP trunk. I can dial this specific number from outside the network just fine, but it is the only that is failing across the SIP trunk. I have made calls to similar numbers and they are all routing out the same path. When I dial 18667173880, there is silence for about ten seconds, then fast busy, when I dial any other 18XX number, including 18666978487, the call proceeds and connects. I am not very familiar with SIP Debugs, but I see what I think are key messages:
SIP/2.0 408 Request Timeout
SIP/2.0 503 Service Unavailable
I do not know how much of the debug logs are neccesarry, but I will paste them here with the failed call (8667173880) as well as the successful call (8666978487)
I don't really know SIP at all, but from forum searching, I've found it could possibly be a codec issue, an h323 gateway on the other end that is not campatible due to the lack of an 'allow' sip h323 command, or possibly that the endpoint is just non-responsive. But why then does it pickup when I call from my cell phone?
The .253 is one of the SIP trunks in the route list that is offline. I have taken that trunk out of the list and the problem still exists. Apologies, I should have captured the SIP debug when that trunk was not in the list.
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